Thank you for the question, Tung.
- Print clearly has the variables aligned, so you do need to align the variables x and y.
- You do not need a numeric indicator before the number 8 on the second line. The space inserted before it for purposes of aligning variables is not considered when deciding whether or not to use a numeric indicator.
- Your code switch indicators are placed quite correctly. (The opening code switch indicator is placed on a line with text preceding spatial material with a blank line following it, and the terminator is placed following the blank line after spatial material in cell 1 on a line by itself.)